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A tourist bus was on a journey from city X to city Y.
By 1 p.m. , it had already travelled `4/9`of its journey and passed a lorry which was travelling at an average speed of 36 km/h.
By 3.30 p.m. , the tourist bus reached its destination but the lorry was 35 km behind it .
The lorry had also started travelling from city X.
How long was the lorry's journey from city X to city Y?
(Give your answer as a decimal)
Notes to student: